@conference {109, title = {Invariance Principles for Switched Differential-Algebraic Systems Under Arbitrary and Dwell-time Switching}, booktitle = {Proceedings of the American Control Conference}, series = {NULL}, year = {2015}, month = {June}, pages = {1788--1793}, keywords = {hybrid systems}, author = {P. Nanez and R. G. Sanfelice and N. Quijano} }